Windows Time Data Updates for Tonga, Northern Cypress, Mongolia and Saratov (Russia) is now available

This update addresses the recent time zone changes in Tonga, Mongolia, Northern Cypress and Russian Saratov.

Windows 10 customers are recommended to install the latest cumulative update listed in our update history page.

Help page 4012864 has more details about this change and how it can be obtained for other versions of Windows.